[pylucene-dev] Null Pointer Exception when Extending TokenFilter

[Rob Young]

Python: 2.4.3
PyLucene: 2.0.0

I am trying to write a custom Analyser and TokenFilter but I keep 
getting a NullPointerException whenever I try to place another filter 
after mine. If I change the order of the filters so that mine is last 
everything is fine. Any ideas on what the problem may be?

Also, not a huge problem, but a little confusing. Why do I always have 
to override the constructor, even if I am adding nothing of significance?


from PyLucene import \
    Analyzer, TokenFilter, StringReader, \
    StandardTokenizer, LowerCaseFilter

class TestAnalyzer( Analyzer ):
    def __init__( self ):
        pass
    def tokenStream( self, reader ):
        result = StandardTokenizer( reader )
        # If I change the order of these two filters
        # it works OK
        result = LowerCaseFilter( result )
        result = TestFilter( result )
        return result

class TestFilter( TokenFilter ):
    def __init__( self, input ):
        self.input = input
    def __iter__( self ):
        return self
    def next( self ):
        token = self.input.next()
        if not token:
            raise StopIteration
        return token

text = "A little chunK oF Text foR Me to analyze as a test for this 
problem I'm having"
tokenstream = TestAnalyzer().tokenStream( StringReader( text ) )
for token in tokenstream:
    print token.termText()

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